The docker engine can be extensively configured.
If you want to add any command line options (like -D for debugging) to docker daemon/service, do it in /etc/sysconfig/docker. Check Control and configure Docker with systemd for basic instructions.
Other area you might tweak is Network configuration.
If you want to change setting of storage that docker engine uses, check docker-storage-setup script.
If you want to use your own registry, check Docker Registry. In that case you’ll probably want to add your registry to /etc/containers/registries.conf file.
Authors: Budh Ram Gurung, Jarek Prokop, Lukas Häusermann, Nick Dirschel, Pavel Valena
